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Related Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 16, 2018
Sep. 20, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]                
Average invested assets percentage           2.00%    
Operating expenses       $ 19,051 $ 16,502 $ 22,272 $ 66,819 $ 47,207
Property management fees percentage           3.00%    
Gross revenue percentage           1.00%    
Construction management fee percentage           5.00%    
Underwriting Compensation Percentage of Gross Proceeds Received       9.00%   9.00%    
Related Party Transaction, Shares Outstanding     563,440 563,440        
Griffin Capital Essential Asset Advisor II, LLC [Member]                
Related Party Transaction [Line Items]                
Related Party Transaction, Shares Sold   263,992            
Related Party Transaction, Proceeds from Sell of Shares   $ 2,500            
Advisor and Property Manager Fees - Performance Distribution [Member]                
Related Party Transaction [Line Items]                
Performance Distribution, Percentage Of Total Return       12.50%   12.50%    
Operating expenses       $ 6,200 213 $ 2,394 0 $ 0
Performance Distribution, Hurdle Rate, Annualized Rate Of Return On Net Asset Value       5.50%   5.50%    
Performance Distribution, Distribution Percentage On Excess Profits Before Threshold           100.00%    
Performance Distribution, Distribution Threshold           12.50%    
Performance Distribution, Distribution Percentage On Excess Profits After Threshold           12.50%    
Related Party Transaction, Amounts of Transaction $ 1,200              
Reimbursement, Services Provided That Are not Entitled to Advisor Fees | Griffin Capital Essential Asset Advisor II, LLC [Member]                
Related Party Transaction [Line Items]                
Operating expenses       $ 600 500      
Reimbursement, Services Provided That Are not Entitled to Advisor Fees | Griffin Capital Essential Asset Advisor, LLC                
Related Party Transaction [Line Items]                
Operating expenses           $ 700 500  
Reimbursement, Reimbursable Expenses                
Related Party Transaction [Line Items]                
Average invested assets percentage       2.00%        
Sales revenue goods percentage       25.00%   25.00%    
Reimbursement, Reimbursable Expenses | Griffin Capital Essential Asset Advisor II, LLC [Member]                
Related Party Transaction [Line Items]                
Operating expenses       $ 70 100      
Reimbursement, Reimbursable Expenses | Griffin Capital Essential Asset Advisor, LLC                
Related Party Transaction [Line Items]                
Operating expenses           $ 200    
Dealer Manager Agreement [Member]                
Related Party Transaction [Line Items]                
Dealer Manager Fee Percentage           0.50%    
Underwriting Compensation Percentage of Gross Proceeds Received       10.00%   10.00%    
Dealer Distribution Fee [Member]                
Related Party Transaction [Line Items]                
Underwriting Compensation Percentage of Gross Proceeds Received       9.00%   9.00%    
Griffin Capital Essential Asset REIT, Inc. [Member]                
Related Party Transaction [Line Items]                
Percentage of acquisition fees (percent)       2.50%   2.50%    
Percent reimbursed (percent)       0.50%   0.50%    
Percentage of purchase price of properties       0.60%   0.60%    
Percentage of contract purchase price       6.00%   6.00%    
Disposition fee, percent of contract sales price       3.00%   3.00%    
Disposition fee, percent of competitive commission       50.00%   50.00%    
Disposition fee, percent of aggregate contract sales price       6.00%   6.00%    
Asset management fee percentage of average invested assets       0.75%   0.75%    
Average invested assets percentage       2.00%   2.00%    
Sales revenue goods percentage       25.00%   25.00%    
Property management fees percentage       3.00%   3.00%    
Gross revenue percentage       1.00%   1.00%    
Construction management fee percentage       5.00%   5.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Griffin Capital Essential Asset Advisor, LLC | Executive Officer [Member]                
Related Party Transaction [Line Items]                
Operating expenses           $ 600 400  
Griffin Capital Essential Asset REIT, Inc. [Member] | Griffin Capital Essential Asset Advisor, LLC | Officer [Member]                
Related Party Transaction [Line Items]                
Operating expenses           $ 200 $ 200  
Griffin Capital Essential Asset REIT, Inc. [Member] | Reimbursement, Services Provided That Are not Entitled to Advisor Fees | Griffin Capital Essential Asset Advisor, LLC                
Related Party Transaction [Line Items]                
Operating expenses     $ 400          
Griffin Capital Essential Asset REIT, Inc. [Member] | Reimbursement, Reimbursable Expenses | Griffin Capital Essential Asset Advisor, LLC                
Related Party Transaction [Line Items]                
Operating expenses     $ 200   $ 100      
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Share of Net Sale Proceeds | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage       6.00%   6.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage       5.00%   5.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage       10.00%   10.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage       15.00%   15.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Share of Net Sale Proceeds | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       6.00%   6.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       8.00%   8.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Share of Net Sale Proceeds | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       8.00%   8.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Incentive Listing Distribution | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage       6.00%   6.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage       5.00%   5.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage       10.00%   10.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage       15.00%   15.00%    
Compensation payable, number of trading days       30 days   30 days    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Incentive Listing Distribution | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       6.00%   6.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       8.00%   8.00%    
Compensation payable, distribution period       7 months   7 months    
Compensation payable, 30 day commencement period       6 months   6 months    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Incentive Listing Distribution | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       8.00%   8.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Compensation payable, distribution period       19 months   19 months    
Compensation payable, 30 day commencement period       18 months   18 months    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Termination | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage       6.00%   6.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage       5.00%   5.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage       10.00%   10.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage       15.00%   15.00%    
Compensation payable, percent owed within first 30 days       33.33%   33.33%    
Compensation payable, termination date range one       30 days   30 days    
Compensation payable, percent owed at one year anniversary       33.33%   33.33%    
Compensation payable, termination date range two       1 year   1 year    
Compensation payable, percent owed at two year anniversary       33.33%   33.33%    
Compensation payable, termination date range three       2 years   2 years    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Termination | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       6.00%   6.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       8.00%   8.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Termination | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       8.00%   8.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage       6.00%   6.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage       5.00%   5.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage       10.00%   10.00%    
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage       15.00%   15.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       6.00%   6.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       8.00%   8.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity                
Related Party Transaction [Line Items]                
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage       8.00%   8.00%    
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage       10.00%   10.00%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Corporation | Affiliated Entity                
Related Party Transaction [Line Items]                
Excess merger consideration, trading restriction on stock from date of receipt       1 year   1 year    
Common Class T [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00274%   0.00274%    
Common Class T [Member] | Dealer Manager Agreement [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00274%   0.00274%    
Related Party Fee Percentage, Sales Commission On Stock Offering           3.00%    
Common Class T [Member] | Dealer Distribution Fee [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00068%   0.00068%    
Common Class T [Member] | Advisor Distribution Fee [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00205%   0.00205%    
Common Class T [Member] | Advisory Agreement [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00342%   0.00342%    
Common Class S [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00274%   0.00274%    
Common Class S [Member] | Dealer Manager Agreement [Member]                
Related Party Transaction [Line Items]                
Related Party Fee Percentage, Sales Commission On Stock Offering           3.50%    
Common Class D [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00068%   0.00068%    
Common Class AA [Member] | Dealer Manager Agreement [Member]                
Related Party Transaction [Line Items]                
Stockholder Servicing Fee, Daily Accrual Rate       0.00274%   0.00274%    
Limited Partnership Units [Member] | Advisor and Property Manager Fees - Performance Distribution [Member]                
Related Party Transaction [Line Items]                
Related Party Transaction, Amounts of Transaction $ 1,200              
Related Party Transaction, Cash Election 50.00%